Superpave Gyratory Compactor (SGC) is used to design high quality mix asphalt specimen. In this research the structure of the SGC was analyzed, and the methods used in the Stewart mechanism are adopted. Based on the hypothesis that the parts made up of the mechanism are rigid body, no deformation exists in the connecting rods. Equations are deduced and the position is presented. The positions of the joint are acquired from the equations by MATLAB. Finally the elements that affect the title angle between the swivel panel and the perpendicular z axis are calculated, and the optimal parameters are presented.

Noise reduction in piston pumps has been being the focus research. Many methods have been designed to smooth it. Research shows that noise takes place at the time when pistons enter the discharge port or enter the suction port. In fact, noise is induced by imbalance pressure in piston chamber. In this paper, piston initial volume and instantaneous controlled volume are deduced. Equations describing pressure angle-rate-of-change are also deduced. Keep the pressure increment equal when the pump eccentric distance is maximum and minimum, and then find out the optimal structure parameters. The parameters makes the pressure ripple minimize and makes the lowest noise.

This paper presents a new method for design equal contact stress raceway curve of radial piston motor. The positive pressure between roller and raceway is calculated by force analysis, by means of this result, the paper gives method for design equal contact stress raceway curve and derived equations for calculate contact stress between roller and raceway. Utilized arithmetic solution of the equations, the characteristic of curve is simulated, the simulation result confirmed that this design method is feasible, detailed study of this kind of curve need to be carried out in the future.

Two-dimensional(2D) vortex dynamics was studied in an YBa_2Cu_3O_7/ PrBa_2Cu_3O_7 superlattice by measuring the I-V characteristics. In the high current limit, 2D collective creep was observed with an activation energy characterized by U(j)=a j^u. A dislocation mediated vortex melting happened when the temperature increased. In the low current limit, the exponential growth of energy barrier for elastic motion was prohibited by the plastic deformation of vortices. A plateau in the resistive transition was observed, which was attributed to possible quantum tunneling of vortices. Our results suggest that a 2D vortex glass can not exist at any temperature, including T=0 K.

We have studied flux line confinement by regular arrays of submicron holes (triangular and square antidot lattices) in superconducting films. Critical current density j c and pinning force f p are very strongly enhanced due to pinning of single or multi-quanta vortices by the antidots. Direct measurements of j c and f p for several well-defined antidot diameters D , proves that pinning centers with size considerably larger than the temperature-dependent coherence length ξ( T ) are much more efficient than those with D \congξ( T ).

The magnetic field (H) - temperature (T) phase boundary has been measured for mesoscopic superconducting samples of different topology (lines, loops and dots). Both the quantization effects and the slope of the Hc(T) line are fully governed by the confinement geometry. As a result, “quantum design” of superconducting critical parameters of mesoscopic systems becomes possible.

We report on the magnetoresistance R(H) measurements on high Tc YBa2Cu3O7/PrBa2Cu3O7 multilayers. A phenomenological theory based on single vortex motion (where R(H,T) = H/(aexp(U/T)+p(H/Rn))) was used to fit the experimental data. This theory, which fits the magnetoresistance data quite well in both the low and the high resistance part contains three parameters: U, p and a. For the activation energy U we used the field dependence: U ∝ H-0.53 which was obtained from a fit of the resistive transition R(T) with the relation for thermally activated flux flow (TAFF): R = R0exp(-U/T). The parameter p determines the relative strength of the flux flow and is found to decrease with decreasing temperature. The parameter a, which characterizes the TAFF, increases with decreasing temperature, thus demonstrating the dominance of this mechanism at lower temperatures.

The superconducting field (H)-temperature (T) phase boundary has been measured in mesoscopic Al samples of different topology: lines, open and filled squares, which were made under the same conditions from the same material. These samples clearly show different superconducting H-T phase boundaries which are nicely reproducing the predictions of the theoretical calculations made for their particular confinement geometries. The confinement of the flux lines by the lattice of the submicrometer holes has been studied in the Pb/Ge multilayers. A substantial enhancement of the critical current jc has been achieved. Sharp integer and rational matching peaks in the jc(H) curve are observed. The possibility of the "quantum design" of the superconducting critical parameters (Hc(T) and jc(T, H)) of the mesoscopic and nanostructured superconductors by optimizing the confinement geometry for the superconducting condensate and for the flux lines has been demonstrated.

The Enschi district in Hubei province, Peoples Republic of China is geochemically one of the two seleniferous regions, producing both selenium (Se) black tea and the Se green tea. Three samples of green tea with different Se contents and one non-Se tea were analysed. The following mineral and trace elements were determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES): K, Ca, Mg, Na, P, S, Al, Mn, Fe, Ba, Sr, Co, Ni, Cu, Zn, Mo, and Cr. Except for Mo, Co, and Cr, all other elements in infusions of the samples analysed were also measured, since their concentrations are lying over their detection limits. The Se content in the tea samples and in the infusions were measured with graphite furnace atomic absorption spectrometry (GFAAS). The accuracy of Se determination was tested by measuring untreated tea samples with instrumental neutron activation analysis (INAA). The Se content in the measured samples was 1 to 8.5 mug/g. In addition to Se, 17 other elements were measured in the tea samples and 14 others in the infusions. With this data the extractible part of this elements in the infusion were calculated. Up to 10% of the Se was found in a first infusion.

Das Enschi-Gebiet in der Provinz Hubei ist geochemisch eine der beiden selenreichen Regionen Chinas. Hier werden die grünen und schwarzen Selen-Tees produziert. Drei Proben eines grünen Tees mit verschieden hohen Se-Gehalten sowie eine selenarme Probe wurden in dieser Arbeit untersucht. Die Mineralstoffe und Spurenelemente K, Ca, Mg, Na, P, S, Al, Mn, Fe, Ba, Sr, Co, Ni, Cu, Zn, Mo und Cr wurden mittels Atomemissionsspektrometrie mit induktiv gekoppelter Plasmaanregung (ICP-AES) bestimmt. Außer Mo, Co und Cr wurden alle oben genannten Elemente in den Aufgüssen der untersuchten Selen-Tees ebenfalls mit der ICP-AES gemessen. Die Se-Gehalte in den Teeproben sowie in den Aufgüssen wurden mit Graphitrohr-Atomabsorptionsspektrometrie (GFAAS) bestimmt. Zur Kontrolle der Richtigkeit der Se-Messung wurden die Se-Gehalte in unaufgeschlossenen Teeproben zusätzlich mit instrumenteller Neutronenaktivierungsanalyse (INAA) bestimmt. Es wurden Se-Gehalte im Bereich von 1 bis 8,5 μg/g Trockengewicht gemessen. Außer Se wurden insgesamt 17 Elemente im Tee und 14 in dessen Aufguß quantitativ bestimmt. Daraus wurde der Auslaugungsgrad für die einzelnen Elemente berechnet. Bis zu 10% des Se konnten in einem ersten Aufguß ausgelaugt werden.